Hi guys, I installed my DCI few months ago and I recently just realized my car is running without the intake duct. The reason is because the guy at the auto repair shop didn't put it back on after he uninstalled the stock air filter box. And I wasn't aware that the intake induct, which I thought it is just needed for the stock intake, was supposed to be there with the DCI. I had already thrown away the stock air filter box and the intake duct. Although the DCI is running without any problem even without the intake duct, I'm actually curious if the intake duct would cause any effect to the engine in terms of performance and longevity. Do you guys think it is worth for me to order the intake duct and put it back on? By the way, I have the DD V2 vented hood, and the left vent on the hood is actually nearby the DCI area. Would the vent help suck the air into the DCI?

The intake duct with DCI is useless... The OEM intake duct works off pressure/vaccum in which when you install the DCI is out the window..
So if your gonna keep your DCI, the stock intake ducts is useless.

Go grab a K&N recharge kit and clean those filters..

IF you had aftermarket air intake scoops in conjunction with the oem intake duct, then it would be useful

The intake duct with DCI is useless... The OEM intake duct works off pressure/vaccum in which when you install the DCI is out the window..
So if your gonna keep your DCI, the stock intake ducts is useless.

Go grab a K&N recharge kit and clean those filters..

IF you had aftermarket air intake scoops in conjunction with the oem intake duct, then it would be useful

So if I put air scoops on along with the intake duct, will this set up actually bring down the IAT and increase the performance?

It will bring more air and more ambient air into the engine bay by the DCI, if setup correctly. More ambient air the DCI are sucking in the better. This in turn may help lower IAT's and help performance. But we are talking slightly, and only at speed where air is actually entering in enough volume in the area of the DCI.

As you can tell the stock snorkel has no scoops, like i mentioned before, it relies on pressure/vaccum to suck air in and to the air box.
So without scoops, the oem snorkel with DCI is useless anyways. Snorkle with scoops and DCI is a good combine. I personally run it and like it.

It will bring more air and more ambient air into the engine bay by the DCI, if setup correctly. More ambient air the DCI are sucking in the better. This in turn may help lower IAT's and help performance. But we are talking slightly, and only at speed where air is actually entering in enough volume in the area of the DCI.

As you can tell the stock snorkel has no scoops, like i mentioned before, it relies on pressure/vaccum to suck air in and to the air box.
So without scoops, the oem snorkel with DCI is useless anyways. Snorkle with scoops and DCI is a good combine. I personally run it and like it.

As you mention the air scoops and snorkel will bring in more ambient air into the engine bay, I guess you are assuming that DCI are breathing in hot air without them. But doesnt FMIC functions to lower the temperature of the engine? So even if the DCI are breathing in hot air, won't the FMIC still cool down the hot air that engine is taking? Then that makes breathing in more cold air totally pointless?